In many cases, B12 shots are available by prescription only
The severity of a B12 deficiency plays a key role, as does the type and severity of nerve pain
For an excellent review of diagnostic issues in fatigue-associated conditions and brain effects, see Baraniuk (2023), FM, and GWS
It physically reconstructs dendritic spines [18]
Each is the latest step in a distinct multi-decade research lineage, and understanding those lineages explains why the two look so different despite chasing the same endpoint
The reality of oral administration for musculoskeletal indications is straightforward: the peptide disperses through the digestive system before it reaches the injury site, and what arrives at a tendon or joint after that journey is a fraction of what a subcutaneous injection placed near the tissue delivers